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Project - AACR

AACR Questions

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The figure shows a cell with the following labeled:• Molecule AB. There is a high concentration of molecule AB inside the cell and a low concentration outside the cell.• A channel molecule AB can pass through.• An enzyme outside the cell that rapidly splits molecule AB into two parts, part A and part B.There are many channels and enzymes.

a) What determines the amount of molecule AB outside the cell at any given time?

Consider a pond where two species of phytoplankton (algae), A and B, live. Both species need phosphorus to grow, and there is not enough phosphorus in the pond for both species to grow indefinitely. Over time, species A and B both remained in the pond, with A more abundant than B. How would a biologist explain why this happened? (Note: neither species consumes the other species.)

Consider a pond where two species of phytoplankton (algae), A and B, live. Both species need phosphorus to grow, and there is not enough phosphorus in the pond for both species to grow indefinitely. Over time, species A dominated the pond, and species B declined to extinction. How would a biologist explain why this happened? (Note: neither species consumes the other species.)

1) The same kind of blood flows through two very long identical blood vessels. Each vessel has the same diameter. A scientist measures the pressure of the blood near the beginning and near the end of each blood vessel.

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This material is based upon work supported by the National Science Foundation (DUE grants: 1438739, 1323162, 1347740, 0736952 and 1022653). Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.